default or selected kernelversion does not have config value CONFIG_CRYPTO_BLKCIPHER.
Result is shown for kernelversion 6.8.2

CONFIG_CRYPTO_BLKCIPHER (not configurable)

configname: CONFIG_CRYPTO_BLKCIPHER

Linux Kernel Configuration
└─>Cryptographic API
└─>CRYPTO_BLKCIPHER
In linux kernel since version 2.6.19 (release Date: 2006-11-29)  

depends
CONFIG_CRYPTO