From the course: CISSP Cert Prep (2021): 3 Security Architecture and Engineering
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Cipher modes
From the course: CISSP Cert Prep (2021): 3 Security Architecture and Engineering
Cipher modes
- [Instructor] Block ciphers work in a variety of different modes. The cipher mode just describes the way that the cryptographic algorithm interacts with each block of plain text that it's encrypting or cipher text that it's decrypting. Let's talk about a few of the common cipher modes. Electronic Codebook or ECB mode is perhaps the most straightforward cipher mode. The algorithm simulates a digital code book that provides an encrypted version of each possible input. For example, if we have a message of 192 bits that we want to encrypt and we're using a 64-bit block cipher, the algorithm breaks the message up into three blocks and handles each of them completely independently. It takes the first block and uses the encryption algorithm to encrypt it with the encryption key, producing the first cipher text block. It then moves on to the second plain text block and encrypts it with the same key, producing the second cipher…
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