DES-EDE3-CFB1 ENCRYPTION TOOL
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AES-128-CBC AES-128-CBC-CTS AES-128-CBC-HMAC-SHA1 AES-128-CBC-HMAC-SHA256 AES-128-CCM AES-128-CFB AES-128-CFB1 AES-128-CFB8 AES-128-CTR AES-128-ECB AES-128-GCM AES-128-GCM-SIV AES-128-OCB AES-128-OFB AES-128-SIV AES-128-WRAP AES-128-WRAP-INV AES-128-WRAP-PAD AES-128-WRAP-PAD-INV AES-128-XTS AES-192-CBC AES-192-CBC-CTS AES-192-CCM AES-192-CFB AES-192-CFB1 AES-192-CFB8 AES-192-CTR AES-192-ECB AES-192-GCM AES-192-GCM-SIV AES-192-OCB AES-192-OFB AES-192-SIV AES-192-WRAP AES-192-WRAP-INV AES-192-WRAP-PAD AES-192-WRAP-PAD-INV AES-256-CBC AES-256-CBC-CTS AES-256-CBC-HMAC-SHA1 AES-256-CBC-HMAC-SHA256 AES-256-CCM AES-256-CFB AES-256-CFB1 AES-256-CFB8 AES-256-CTR AES-256-ECB AES-256-GCM AES-256-GCM-SIV AES-256-OCB AES-256-OFB AES-256-SIV AES-256-WRAP AES-256-WRAP-INV AES-256-WRAP-PAD AES-256-WRAP-PAD-INV AES-256-XTS ARIA-128-CBC ARIA-128-CCM ARIA-128-CFB ARIA-128-CFB1 ARIA-128-CFB8 ARIA-128-CTR ARIA-128-ECB ARIA-128-GCM ARIA-128-OFB ARIA-192-CBC ARIA-192-CCM ARIA-192-CFB ARIA-192-CFB1 ARIA-192-CFB8 ARIA-192-CTR ARIA-192-ECB ARIA-192-GCM ARIA-192-OFB ARIA-256-CBC ARIA-256-CCM ARIA-256-CFB ARIA-256-CFB1 ARIA-256-CFB8 ARIA-256-CTR ARIA-256-ECB ARIA-256-GCM ARIA-256-OFB CAMELLIA-128-CBC CAMELLIA-128-CBC-CTS CAMELLIA-128-CFB CAMELLIA-128-CFB1 CAMELLIA-128-CFB8 CAMELLIA-128-CTR CAMELLIA-128-ECB CAMELLIA-128-OFB CAMELLIA-192-CBC CAMELLIA-192-CBC-CTS CAMELLIA-192-CFB CAMELLIA-192-CFB1 CAMELLIA-192-CFB8 CAMELLIA-192-CTR CAMELLIA-192-ECB CAMELLIA-192-OFB CAMELLIA-256-CBC CAMELLIA-256-CBC-CTS CAMELLIA-256-CFB CAMELLIA-256-CFB1 CAMELLIA-256-CFB8 CAMELLIA-256-CTR CAMELLIA-256-ECB CAMELLIA-256-OFB CHACHA20 CHACHA20-POLY1305 DES-EDE-CBC DES-EDE-CFB DES-EDE-ECB DES-EDE-OFB DES-EDE3-CBC DES-EDE3-CFB DES-EDE3-CFB1 DES-EDE3-CFB8 DES-EDE3-ECB DES-EDE3-OFB DES3-WRAPThe DES-EDE3-CFB1 algorithm is a symmetric-key block cipher mode that combines the Triple Data Encryption Standard (Triple DES or 3DES) with the Cipher Feedback (CFB) mode, specifically operating in a 1-bit feedback configuration. This algorithm extends the DES encryption standard by applying the encryption-decryption-encryption sequence (EDE) using three independent DES keys, providing enhanced security over single DES encryption.
Key Structure
DES-EDE3 employs three separate 56-bit DES keys, denoted as K1, K2, and K3. The effective key length is 168 bits, which significantly increases the resistance against brute-force attacks compared to standard DES. Each key is applied in the following sequence: encryption with K1, decryption with K2, and encryption again with K3, forming the EDE triple-layer process.
Operational Mode: CFB1
The algorithm utilizes the Cipher Feedback mode with a 1-bit segment size (CFB1). In this configuration, the previous ciphertext bit is fed back into the encryption process to influence the next bit of output. This feedback mechanism allows DES-EDE3-CFB1 to function as a self-synchronizing stream cipher, making it suitable for encrypting data streams of arbitrary length. The 1-bit feedback ensures that even a single-bit error in transmission propagates through subsequent bits, enabling error detection in some communication scenarios.
Encryption Process
Encryption begins with an initialization vector (IV) of the same block size as DES (64 bits). The IV is first encrypted with the Triple DES EDE sequence. The most significant bit of the encrypted block is then XORed with the plaintext bit to produce the ciphertext bit. This ciphertext bit is shifted into the feedback register, and the process repeats for the next plaintext bit. The sequential 1-bit operation continues until all plaintext bits are encrypted.
Decryption Process
Decryption mirrors the encryption steps. The same IV is used, and the ciphertext bits are processed through the Triple DES EDE sequence. Each decrypted output bit is XORed with the corresponding ciphertext bit to recover the plaintext. Because of the 1-bit feedback mechanism, decryption requires precise synchronization with the encryption sequence to ensure data integrity.
Security Considerations
DES-EDE3-CFB1 inherits the security properties of Triple DES, including resistance to single DES brute-force attacks and certain forms of differential cryptanalysis. The 1-bit CFB mode introduces bit-level error propagation, which can be advantageous in detecting transmission errors but requires careful handling in data communication systems. Proper selection of unique and unpredictable IVs for each encryption session is critical to maintaining security and preventing pattern exposure in encrypted streams.
Applications
This algorithm is commonly employed in environments where legacy DES infrastructure exists, and where a stream-oriented encryption method is required. It is suitable for securing serial data transmissions, network protocols, and systems requiring bit-level encryption granularity while leveraging the enhanced security of Triple DES.